That is actually all the more reason to force an upgrade.. I want my mother-in-law's system to be as up to date as it can, because she won't care what version of Windows she runs, so long as she can do internet banking and look at pictures of everyone's grandchildren. Security updates are there for a reason, and the non-technical people are those that need to get it first.
IMO, this comes down to "how large a download should be allowed with no user intervention", rather than "should automatic upgrades be allowed?"





